Along with Rachael and Sunshine, she faces the boot in tonight's first public vote.
While talking to fellow nominee Rachael, the 24-year-old said that Big Brother had asked her how she felt about potentially being the first person to leave the house.
"How do you think I feel, its social suicide," she said, before suggesting: "Maybe if I vomit I'll feel better."
Caoimhe then spoke to Shabby about who she would like there for her if she leaves. "There is one person I want there and it's definitely not my mother," replied Shabby.
A shocked Caoimhe told her that she shouldn't say things like that, before Shabby explained: "She'll just be terribly disappointed."